Dynamo-electric machine.



R. E. HELLMUND.

DYNAMO meme MACHINE. APPLICATION man FEB-4.19M. 1,301,845; Patented Apr. 29, 1919.

2 SHEETS-SHEET 1- WITNESSES:

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lNVENfOR p a single inclosing frame.

UNITED STATES" PATENT OFFICE.

BUDOLF E. HELLMTINDQOF PITTSBURGH, PENNSYLVANIA, ASSIGNOB TO WEST- INGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA Specification of Letters Patent.

Patented Apr. 29, 1919.

Application filed February 4, 1016. Serial n 75,155.

To all whom it may concern:

Be it known that I, RonoLF E. HELL- MUND, a subject of the Emperor of Germany, and a resident of Pittsbur h in the county of Allegheny and State ot system "of-ventilation for a motor of the above-described type whereby the currentcarrying parts and the magneti'zable core members are maintained at a substantially uniform temperature. p p

In theconstruction of motors for electric railway vehicles, particularly of the singlephase, commutator type, it has been found diflicult to utilize the total width available between the sides of the supporting'frames by a single armature and commutator cylinder and obtain, at the same time, the proper proportions of the armature winding and commutator cylinder necessary for good commutation. I therefore construct a motor in which-the armaturecore is subdivided and provided" with a plurality of separate armature windings and commutator cylinders, all of which are carried on a single shaft.- The stationary field-ma net-core is also subdivided and the entire field-magnet and armature structuresare arranged within My invention lies in the method of ventilation of a dynamo-electric unachine of the that completely inclosed the operatin -the .present invention,

abovedescribed typei With machines of large capacity, as heretofore constructed, the usual methods -of ventilation have been handicapped by' the presence of housings parts of the machine, thus giving rise to 1 her initial operating temperatures... Furt ermore, since,-theventilating medium was usually introduced into such inclosing housings at only one side of. the machine, it folf lowed thatthe parts of the machine nearest the inlet opemng .were maintained at alower temperature than other parts of the machine remote therefrom. According to ducts between the several portions of the core members and provide parallel longlthroughout the machine,

7 Pennsyl-. vama', have lnvented a new and useful Im- I employ ventilating.

. tu'dinal' passages in the core members,

whereby the air isequally distributed thus securing a substantially uniform temperature of. all parts. I provide also means whereby air currents are directed over the surfaces of the commutator cylinders and through passagesin suchcylinders. This arrangement 1s particularly advantageous in viewof the relatively hi h operating temperatures that are attained y the commutator cylinders of sin lehase motors."

n t e. accompanying drawings, Figure 1 is a view, partially in section. and partially in side elevation, of a plural-armature motor embodying my invention; Figs. 2 and 3, respectively, are views similar to Fig. 1 showing modifications of my invention and 4 is a fragmentary detail view of the ma I etizable membersshown in Fig. 1.

. he motor shown in Fig. 1 comprises a frame 1' having annular end flanges 2 and 3 and annular internal ribs 4 and 5. Annular magnetlzable core members 6 and 7 are composed of laminations or plates and are respectively secured between suitable end plates 9 and 10. The end-plates 9- of the member 6 are secured to the flange 2 and the ib 4, and the end-plates 10 of the mem her 7 are secured to the flange 3 and the rib 5 of the frame 1. Longitudinal passages 11 are provided in the members 6 and 7 and in the end-plates 9 and 1 0. The flanges 2 and 3 are respectively provided with openings 13 and 14 which communicate with openings '15 and '16 that are provided in the top of the frame 1' above the core members 6 and 7. A central opening 17 connects the space 12 between 'the ribs 4 and 5 with the outside atmos here.

and-23. The s iders 19 and 20 respectively comprise radia ribs 24 and 25 upon whichare supported annular magnetizable -members 26 and 27. 'The members 26 and 27 are-composed of plates or 'laminations and are respectively secured between end plates 29 and '30. Longitudinal passages 31 are provided in the members 26v and 27 and 1n the end-plates 29 I and 30. The inner periphcries of members 26 and 27 are further provided with corrugations 28, as best shown in Fig. 4, thus forming passages 32 between the core members and the supporting ribs 24 and 25. Gommutator cylinders 33 and 34 are respectively mounted upon annular supporting members 35 and 36 that are carried by the ribs of the spiders. The'supporting members 35 and 36 are respectively provided with spaced openings 37 and 38.

Armature windings 39 and 40 are carried in suitable slots provided in theiore members 26 and 27, and are respectively connected to' the bars of the commutator cylinders 33 and 34, in the usual manner. The inne1 ends of'the coils of each armature winding are bent to project radially inwardlytoward the shaft 18 as indicated at 41 and 42. The bent-over portions 41 and 42 are supported and protected by brackets 43, in a manner similar to that described in a copending application, Serial No. 75,932 filed February 3, 1916, by R. E. Hellmund and R. E. Ferris, and assigned to the Westinghouse Electric & Manufacturing Company. The brackets 43 are provided with openings 44 that register with the passages 31. The ribs 24 and 25 are provided with up-turned extensions" 45 that are contiguous to the inner ends of the passages 32 and abut each other to form a'closare for the central duct 46 between the adjacent faces of the brackets 43.- Exciting field windings 47 and cross-field windings 48 are located in suitable" slots in the core members 6 and 7 and are interlinked with the core members so that each of the windings 47 .51'register with the openings 37 and 38 and the outer openings 52 are adjacent to the outer surfaces of the commutator cylinders 33 and 34. The members 49 and 50 are provided with lateral flanges 53 and 54 that are respectively secured to the flanges 2 and 3 of the frame 1, air chambers 55 and 56 being thus provided. The members 49 and 50 are further provided with air-inlet pipes 49 and 50 that are connected to, or provided with, a suitable means for creating a circulation of air, such, for example, as blower fans 57. When the fans 57 are operated, air will be delivered by the openings 51 into the openings 37 and 38 and. by the openings 52 over the external surfaces ofthe commutator cylinders into the chambers 55 and 56. The air will then pass in parallel paths from the openings 37 v and 38 through the passages 31 and 32 to the central duct 46 and from the chambers 55 and 56 through the passages 11 to the central duct 12 from whence it will be cylinders.

discharged through the opening 17. Air

will also pass through the communicating openings 13 and 15 and '14 and 16', respec- Y will be effectively cooled by parallel aii' currents flowing at substantially equal velocities. Furthermore, all the exposed portions of the field windings 47 and 48 will be sub jected to the air currents.

In the modification shown in Fig. 2, the frame 1 comprises two separate portions 1 and l that are secured together in any suitable manner, as by bolts 91 and nuts 92 00- acting with lugs 93 provided on each of the frame portions. Annular end casings 58 and 59 are located at the respective ends. of the-motor with their inner edges closely adjacent to the outer edges of the commutator Air from the fans 57 is delivered by the casings 58 and 59 to the spaces between the radial ribs of the spiders 19 and 20, and the rotation of the shaft forces the air radially outward from the central duct 46 to the duct 12. The air then'fiows from the central ducts in parallel paths through the passages 11 and 31, respectively, to the outside atmosphere. The passages 31 are located abo ve the commutator cylinders 33 and 34 so that a portion of the air in pass-. lng

out of the machine is discharged over the external "surfaces of the commutator cylinders.

In the modification shown in Fig. 3, the armature core members 26 and 27 are mounted on the continuous ribs 60 of a single spider 61. The portions 60 of the ribs 60 that support the commutator cylinders 33 i and 34'project radially outward so that the spaces between the portions 60 communicat a with the longitudinal passages'31 in the core members 26 and 27. End casings 58 and 59 are located at the respective ends of the motor, and annular baflieplates 62 are provided at the respective ends of the. spider 61 to direct the air from the endcasings into, the

spaces between the rib portions 60 and into the passages 31 and duct 46. The air is then forced radially outward into the duct- 12 from which it is discharged to the outside atmosphere through the passages 11.

While I have shown my invention in its simple and preferred form,.it is not so limited but is capable of various modifications within the scope of the appended claims. I claim as my invention:

1. In a dynamo-electric machine, the combination with an inclosing frame, a plurality of pairs of relatively rotatable magnetizable members located in spaced relation and provided with longitudinal passages, and commutator cylinders carried by the rotatable members, of -eisrternal means for creating a 'circulatlon of air, and further means for d1- recting the circulation of air through saidla surface of said com- A mutator cylinders carried bythe rotatable members and provided with longitudinal passages and over the 5 mutator cylinders.

2. In a dynamo-electric machine, the combinsition with a plurality .of pairs of relative of w ich is provided with longitudinal passages, and commutator cylinders carried by the rotatable members, of external means for'creating a circulation of air, nd further means for directing the circula 1011 of air in parallel paths over andbeneath the surfaces of said commutator cylinders and through said passages. 1 1

3. The combination with a dynamo-electric machine comprising an inclosing frame, a pluralit of pairs members ocated in spaced relation-within said frame, the said members being provided with longitudinal passages, and commutat0r cylinders associated with the rotatable members,-of external means for creating a' circulation of air, and further means for s multaneously directing the circulation of air .over and through said commutator cylinders-in parallel paths and through said passagesfrom each end of said machine.

4. The. combination with, a dynamo-electric machine comprisingan inclosing frame, 'a plurality of pairs of members located-in spaced relation within asaid frame,-the said members being pro- 35, vided with longitudinal passages, and commutator cylinders associated withthe rotatable members, ofexternal means for creatmg a circulation of air, and further means for simultaneously directing the circulation of air from each end of saidmachine over and through said commutator. cylinders, through the said passages and into the space between the said members. g

5. The combination with a dynamo-elec- {5 tric machine comprising an inclosing'frame,

rotatable magnetizable members each of relatively movable relatively rotatable a pluralit of pairs of relatively movable magnetiza le members located in spaced retion within said frame and provided with longitudinal passages, a plurality of compassages, of external means for creating a circulation of air, simultaneously directing the circulation. of air from each end ofsaid machine, through the said assages in the magnetizable members an commutator cylinders and over the surfaces of said commutator cylinders.

6. The combination with a dynamo-electric machine comprising an inclosing frame,-

a pluralit of pairs of relatively movable magnetiza le members located in spaced reand further means for l lation within said frame and provided with longitudinal passages, a plurality of commutator cylinders carried by the rotatable members and provided with longitudinal passages, of external means for creating a circulation of air, and further means for simultaneously directing the circulation of air from each end of-sald machine through the bers and commutator cylinders oger the surfaces of said commutator cylinders and into sllbscribed my name this 27th day of J anl,

- RUD'oLF E. HEL'LMUND.

said passages in the magnetizable mem- 

